Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Crude oil, natural gas and NGLs sales	$ 173,921	$ 338,956	$ 494,236	$ 660,055
Commodity price risk management gain (loss), net	(120,786)	47,349	313,912	(142,725)
Other income	1,281	4,353	3,298	7,828
Total revenues	54,416	390,658	811,446	525,158
Costs, expenses and other:
Lease operating expenses	35,808	34,328	85,342	69,549
Production taxes	7,846	22,642	26,316	44,810
Transportation, gathering and processing expenses	16,949	12,208	30,445	23,632
Exploration, geologic and geophysical expense	728	640	864	3,283
Impairment of properties and equipment	32	28,979	881,106	36,854
General and administrative expense	35,352	42,808	97,517	82,406
Depreciation, depletion and amortization	149,491	168,523	325,648	319,945
Accretion of asset retirement obligations	2,358	1,563	4,978	3,147
Gain on sale of properties and equipment	(174)	(33,904)	(353)	(34,273)
Other expenses	2,003	2,836	4,147	6,390
Total cost, expenses and other	250,393	280,623	1,456,010	555,743
Income (loss) from operations	(195,977)	110,035	(644,564)	(30,585)
Interest expense	(21,782)	(18,900)	(45,955)	(35,868)
Income (loss) before income taxes	(217,759)	91,135	(690,519)	(66,453)
Income tax (expense) benefit	(4,073)	(22,587)	3,672	14,825
Net income (loss)	$ (221,832)	$ 68,548	$ (686,847)	$ (51,628)
Earnings per share:
Basic	$ (2.23)	$ 1.04	$ (7.09)	$ (0.78)
Diluted	$ (2.23)	$ 1.04	$ (7.09)	$ (0.78)
Weighted-average common shares outstanding
Basic	99,566	65,815	96,821	65,998
Diluted	99,566	65,926	96,821	65,998